fix(coords): Chunk-Namen korrekt für Float-Indizes und Newlines

- chunk_name: Reject float/bool indices like JavaScript (Number.isInteger)
- parse_chunk_name: Use fullmatch instead of match($) to reject strings with trailing newlines
- Add invalidIndices fixture cases to catch these edge cases in both languages

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

tools/extract/leonida/coords.py

@@ -32,19 +32,23 @@ def pixel_to_world(px: int, py: int) -> tuple[float, float]:
 
 CHUNKS_PER_SIDE = (SLICE["x1"] - SLICE["x0"]) // CHUNK_SIZE   # 12
 CHUNK_COLUMNS = "ABCDEFGHIJKL"
-_CHUNK_NAME = re.compile(r"^([A-La-l])([1-9]\d?)$")
+_CHUNK_NAME = re.compile(r"([A-La-l])([1-9]\d?)")
+
+
+def _is_index(k) -> bool:
+    return isinstance(k, int) and not isinstance(k, bool) and 0 <= k < CHUNKS_PER_SIDE
 
 
 def chunk_name(i: int, j: int) -> str | None:
     """Planquadrat-Name wie src/world/coords.js: Spalte A–L aus i, Zeile 1–12 aus j. A1 = Nordwest."""
-    if not (0 <= i < CHUNKS_PER_SIDE and 0 <= j < CHUNKS_PER_SIDE):
+    if not (_is_index(i) and _is_index(j)):
         return None
     return f"{CHUNK_COLUMNS[i]}{j + 1}"
 
 
 def parse_chunk_name(name: str) -> tuple[int, int] | None:
     """Umkehrung von chunk_name. Akzeptiert Kleinschreibung, None außerhalb A1–L12."""
-    match = _CHUNK_NAME.match(str(name))
+    match = _CHUNK_NAME.fullmatch(str(name))
     if not match or int(match.group(2)) > CHUNKS_PER_SIDE:
         return None
     return CHUNK_COLUMNS.index(match.group(1).upper()), int(match.group(2)) - 1

tools/extract/tests/test_coords.py

@@ -43,3 +43,8 @@ def test_chunk_names_round_trip_for_all_144_chunks():
     for i in range(12):
         for j in range(12):
             assert parse_chunk_name(chunk_name(i, j)) == (i, j)
+
+
+def test_chunk_names_reject_invalid_index_types():
+    for i, j in NAMES["invalidIndices"]:
+        assert chunk_name(i, j) is None